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Unindentify optocouple

I need to replace some optocouple ( round shape plastic casing ). The
optocouple which trigger a triac and control by a TTL IC, there are
printing on the optocouple "MOD 725", i had desolder some good
optocouple and measure both side with two output lead, the DMM show
infinity in resistance,i could not figure out what kind of optocouple
or any substitute on this type of optocouple.
Dear members, can you give me advice on this question. Thanks and
appreciate your help.
Regards
 
P

Phil Allison

Jan 1, 1970
0
** Groper Alert !
I need to replace some optocouple ( round shape plastic casing ). The
optocouple which trigger a triac and control by a TTL IC,


** Err - so this thing is how old ??

30 or 40 years ?

there are
printing on the optocouple "MOD 725",


** Probably long obsolete.

The MOC3021 is the go.

Its only 25 years old.



........ Phil
 
** Groper Alert !


** Err - so this thing is how old ??

30 or 40 years ?


** Probably long obsolete.

The MOC3021 is the go.

Its only 25 years old.

....... Phil

Hi Phil,Thanks for your help, I think about 35 years, I will try your
suggestion on MOC3021.
 
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